Ammonia spraying grid structure for denitration

Abstract

The utility model relates to the technical field of denitration, and discloses an ammonia spraying grid structure for denitration, which comprises a flue, a baffle plate, an unpowered hood, a connecting pipe and an ammonia gas box. Smoke in the flue circulates from bottom to top. The baffle is arranged in the flue, and a smoke outlet pipe is fixedly connected to the middle of the top end of the baffle in a penetrating mode; the unpowered air cap is located above the baffle and detachably connected with the smoke outlet pipe; the connecting pipe is arranged above the unpowered hood, the side wall of the connecting pipe is fixedly connected with a blowing pipe in a penetrating manner, and the side wall of the blowing pipe is fixedly connected with an ammonia gas nozzle in a penetrating manner; the ammonia gas box is arranged on the outer side of the flue, and the output end of the ammonia gas box is fixedly connected with a gas conveying pipe rotationally communicated with the connecting pipe. According to the ammonia spraying grid structure, the spraying uniformity and the spraying range of the ammonia spraying head can be better improved, so that the working efficiency of the ammonia spraying grid structure is improved, and the mixing uniformity of ammonia gas and flue gas can be better realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of denitration, for example to a kind of ammonia injection grid structure for denitration. BACKGROUND

[0002] SCR denitration is selective catalytic reduction denitration technology, sometimes also called ammonia catalytic reduction denitration, ammonia or other suitable reducing agent is injected into flue gas upstream of catalyst, its ammonia injection grid is used in the flue of the front section of denitration reactor, ammonia is uniformly sprayed into flue by uniformly mixing ammonia gas and flue gas, ammonia gas and nitrogen oxide react through the catalyst pores of denitration reactor, water and nitrogen are generated, nitrogen oxide is removed, and flue gas is discharged in compliance.

[0003] And the existing ammonia injection grid structure for denitration when in use, more in ammonia air mixing passage installs nozzle in dispersion, and since each nozzle needs to install more pipeline, it occupies more space, and also blocks the sprayed ammonia, so that the ammonia sprayed by ammonia injection head is not uniform, and the spraying range is reduced.

[0004] Therefore, how to increase the uniformity and range of the ammonia sprayed by the ammonia injection head and improve the working efficiency of the ammonia injection grid structure has become a technical problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] To have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor is it intended to determine key / important elements or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0006] The disclosed embodiments provide an ammonia injection grid structure for denitration to solve the problem of how to increase the uniformity and range of the ammonia sprayed by the ammonia injection head and improve the working efficiency of the ammonia injection grid structure.

[0007] In some embodiments, the ammonia injection grid structure for denitration comprises a flue, a baffle, a non-powered hood, a connecting pipe and an ammonia tank. The flue gas in the flue flows from bottom to top; the baffle is arranged inside the flue, and the top end of the baffle is fixedly connected with an outlet pipe; the non-powered hood is located above the baffle, and the non-powered hood is detachably connected with the outlet pipe; the connecting pipe is arranged above the non-powered hood, the side wall of the connecting pipe is fixedly connected with a blowing pipe, and the side wall of the blowing pipe is fixedly connected with an ammonia nozzle; the ammonia tank is arranged outside the flue, and the output end of the ammonia tank is fixedly connected with a gas conveying pipe in rotation communication with the connecting pipe.

[0008] Optionally, the opening of the baffle gradually decreases from bottom to top.

[0009] Optionally, the outer side wall of the lower end of the baffle is fixedly connected with a fixing sleeve, the fixing sleeve is located in the flue, and the outer side wall of the fixing sleeve is fixedly connected with the inner wall of the flue.

[0010] Optionally, the bottom surface of the unpowered air cap is fixedly connected with a connecting seat, the bottom surface of the connecting seat is fixedly connected with a second flange; the output end of the smoke outlet pipe is fixedly connected with a first flange, and the first flange is connected with the second flange.

[0011] Optionally, the output end of the smoke outlet pipe corresponds to the middle part of the bottom surface of the unpowered air cap.

[0012] Optionally, the bottom surface of the connecting pipe is fixedly connected with a convex seat, and the bottom surface of the convex seat is fixedly connected with the middle part of the top surface of the unpowered air cap.

[0013] Optionally, the output end of the ammonia gas nozzle faces downward, and the output end of the ammonia gas nozzle corresponds to the side wall air port of the unpowered air cap.

[0014] Optionally, the output end of the gas conveying pipe is provided with a rotary joint, the top surface of the connecting pipe is fixedly connected with an air inlet pipe in a penetrating manner, and the air inlet pipe is in rotational communication with the output end of the gas conveying pipe through the rotary joint.

[0015] Optionally, the bottom surface of the ammonia gas tank is provided with a fixing seat, and the fixing seat is fixedly connected with the outer side wall of the flue.

[0016] The ammonia injection grid structure for denitration provided by the embodiments of the present disclosure can achieve the following technical effects:

[0017] The baffle can block the flue gas flowing through the flue, so that the flue gas can be concentrated and discharged to the unpowered air cap through the smoke outlet pipe, so that the unpowered air cap rotates. The flue gas flows to the ammonia gas nozzle through the air port on the side of the unpowered air cap. The connecting pipe, the injection pipe and the ammonia gas nozzle are driven to rotate by the unpowered air cap. The ammonia gas nozzle rotates and sprays ammonia gas, increases the uniformity and range of the ammonia gas sprayed by the ammonia gas nozzle, stirs the flue gas and ammonia gas to fully mix, and then improves the working efficiency of the ammonia injection grid structure and better realizes the uniformity of the mixing of ammonia gas and flue gas.

[0018] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is a schematic diagram of a blowing pipe structure of the present application;

[0022] Figure 3 is a schematic diagram of an internal structure of a flue of the present application;

[0023] Figure 4 is an enlarged view of A of the present application.

[0024] Reference signs:

[0025] 1, flue; 2, baffle; 3, fixed sleeve; 4, smoke outlet pipe; 5, first flange; 6, unpowered air cap; 7, connecting seat; 8, second flange; 9, convex seat; 10, connecting pipe; 11, blowing pipe; 12, ammonia gas nozzle; 13, air inlet pipe; 14, ammonia gas tank; 15, fixed seat; 16, gas conveying pipe; 17, rotary joint. DETAILED DESCRIPTION

[0026] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0027] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0028] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to represent other meanings, for example, the term "upper" can also be used to represent a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0029] In addition, the terms "set", "connected", and "fixed" should be understood broadly. For example, "connected" can be fixed connection, detachable connection, or integral configuration; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, or internal communication between two devices, elements, or components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure according to specific circumstances.

[0030] Unless otherwise specified, the term "plurality" means two or more.

[0031] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B means A or B.

[0032] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B means that there are three relationships of A or B, or A and B.

[0033] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0034] In combination Figures 1-4 As shown in the drawings, the present disclosure provides a denitration ammonia injection grid structure, which comprises a flue 1, a baffle 2, a non-powered hood 6, a connecting pipe 10 and an ammonia gas tank 14; the flue gas in the flue 1 flows from bottom to top; the baffle 2 is arranged in the inside of the flue 1, and the top middle part of the baffle 2 is fixedly connected with a smoke outlet pipe 4; the non-powered hood 6 is located above the baffle 2, and the non-powered hood 6 is detachably connected with the smoke outlet pipe 4; the connecting pipe 10 is arranged above the non-powered hood 6, the side wall of the connecting pipe 10 is fixedly connected with a blowing pipe 11, and the side wall of the blowing pipe 11 is fixedly connected with an ammonia gas nozzle 12; the ammonia gas tank 14 is arranged outside the flue 1, and the output end of the ammonia gas tank 14 is fixedly connected with a gas conveying pipe 16 which is in rotational communication with the connecting pipe 10.

[0035] The denitration ammonia injection grid structure provided by the embodiments of the present disclosure can block the flue gas flowing through the flue 1 by the baffle 2 arranged, so that the flue gas can be concentrated to be discharged to the non-powered hood 6 through the smoke outlet pipe 4, thereby making the non-powered hood 6 rotate. The flue gas further flows to the ammonia gas nozzle 12 through the air port on the side of the non-powered hood 6. The non-powered hood 6 drives the connecting pipe 10, the blowing pipe 11 and the ammonia gas nozzle 12 to rotate. The ammonia gas nozzle 12 rotates and sprays ammonia gas, increases the uniformity and range of the ammonia gas sprayed by the ammonia gas nozzle 12, and stirs the flue gas and ammonia gas to fully mix, thereby improving the working efficiency of the ammonia injection grid structure and better realizing the uniformity of the mixing of ammonia gas and flue gas.

[0036] It can be understood that the unpowered hood 6 is also called a spherical ventilator and a cyclone ventilator, which is a prior art means.

[0037] It can be understood that one end of the output pipe 16 is connected with the ammonia tank 14, and the other end passes through the flue 1 and is communicated with the connecting pipe 10.

[0038] Specifically, the flue 1 is a circular pipeline structure.

[0039] Optionally, the plurality of injection pipes 11 are radially connected to the side wall of the connecting pipe 10 with the axis of the connecting pipe 10 as the center. In this way, the plurality of injection pipes 11 are radially distributed in the flue 1, and the plurality of injection pipes 11 can cover different areas, so that the ammonia nozzles 12 can spray ammonia into different areas of the flue 1, facilitating the mixing of ammonia and flue gas. Moreover, the number of injection pipes 11 is relatively large, and the amount of ammonia sprayed is relatively large, which can adapt to flue gas with large flow. Moreover, the plurality of injection pipes 11 can better stir the mixing of flue gas and ammonia when rotating in the flue 1.

[0040] Specifically, the injection pipe 11 is provided with six injection pipes 11. In this way, the number of injection pipes 11 is relatively large, and the amount of ammonia sprayed is relatively large, which can adapt to flue gas with large flow. Moreover, the six injection pipes 11 are radially distributed in the flue 1, so that the ammonia nozzles 12 can spray ammonia into different areas of the flue 1, facilitating the mixing of ammonia and flue gas.

[0041] Optionally, each injection pipe 11 is provided with a plurality of ammonia nozzles 12. In this way, the number of ammonia nozzles 12 is relatively large, so that the position of each injection pipe 11 spraying ammonia is relatively large, covering different areas in the flue 1, facilitating the mixing of ammonia and flue gas.

[0042] Specifically, each injection pipe 11 is provided with three ammonia nozzles 12.

[0043] Optionally, the opening of the baffle 2 gradually decreases from bottom to top. In this way, the baffle 2 is used to block the flue gas flowing through the flue 1 to stabilize the flow of the flue gas, and the baffle 2 is small at the top and large at the bottom, so that the flue gas can be concentrated to be discharged to the unpowered hood 6 through the smoke outlet pipe 4, so that the unpowered hood 6 rotates.

[0044] Optionally, the baffle 2 is in an inverted funnel structure. In this way, the flue gas in the flue 1 can be easily gathered towards the middle position of the baffle 2, and the gathered flue gas is discharged to the ammonia nozzle 12 through the rotation of the unpowered hood 6, facilitating the mixing of ammonia and flue gas.

[0045] Optionally, the outer side wall of the lower end of the baffle 2 is fixedly connected with a fixed sleeve 3, the fixed sleeve 3 is located in the flue 1, and the outer side wall of the fixed sleeve 3 is fixedly connected with the inner wall of the flue 1. In this way, the fixed sleeve 3 is in the form of a circular ring, the fixed sleeve 3 is used to be fixed with the inner wall of the flue 1, and the baffle 2 is installed through the fixed sleeve 3.

[0046] It can be understood that the fixed sleeve 3 cooperates with the baffle 2 to block the flue 1, so that the flue gas in the flue 1 can only flow through the smoke outlet pipe 4.

[0047] Optionally, the bottom surface of the unpowered hood 6 is fixedly connected with a connecting seat 7, the bottom surface of the connecting seat 7 is fixedly connected with a second flange 8, the output end of the smoke outlet pipe 4 is fixedly connected with a first flange 5, and the first flange 5 is connected with the second flange 8. In this way, the first flange 5 and the second flange 8 are connected correspondingly, so that the unpowered hood 6 can be installed, the side walls of the first flange 5 and the second flange 8 are both provided with through holes, and the first flange 5 and the second flange 8 can be fixed by cooperating external bolts with the through holes, so that the unpowered hood 6 can be installed, and the stability of the connection is relatively high.

[0048] Optionally, the output end of the smoke outlet pipe 4 corresponds to the middle part of the bottom surface of the unpowered hood 6. In this way, the flue gas in the smoke outlet pipe 4 enters the unpowered hood 6 from the middle part of the bottom surface of the unpowered hood 6, the inflow of the flue gas is more uniform, and the rotation of the unpowered hood 6 is more stable.

[0049] Specifically, the axis of the smoke outlet pipe 4 coincides with the axis of the unpowered hood 6.

[0050] Optionally, the bottom surface of the connecting pipe 10 is fixedly connected with a convex seat 9, the bottom surface of the convex seat 9 is fixedly connected with the middle part of the top surface of the unpowered hood 6, the output end of the ammonia gas nozzle 12 faces downward, the output end of the ammonia gas nozzle 12 corresponds to the side wall air port of the unpowered hood 6, the bottom surface of the ammonia gas tank 14 is provided with a fixed seat 15, and the fixed seat 15 is fixedly connected with the outer side wall of the flue 1. In this way, when the flue gas flows through the unpowered hood 6 through the smoke outlet pipe 4, the flue gas can make the unpowered hood 6 rotate, the spraying pipe 11 can be rotated through the convex seat 9, and the ammonia gas nozzle 12 can be rotated, the ammonia gas nozzle 12 is used to spray ammonia gas, the uniformity and range of the spraying of the ammonia gas nozzle 12 can be increased through the rotation of the ammonia gas nozzle 12, the working efficiency of the ammonia spraying grid structure is improved, and the uniformity of the mixing of the ammonia gas and the flue gas can be better achieved.

[0051] Specifically, the axis of the connecting pipe 10 coincides with the axis of the unpowered hood 6.

[0052] Optionally, the output end of the gas conveying pipe 16 is provided with a rotary joint 17, the top surface of the connecting pipe 10 is fixedly connected with the gas inlet pipe 13 penetratingly, and the gas inlet pipe 13 is in rotational communication with the output end of the gas conveying pipe 16 through the rotary joint 17. In this way, when the spraying pipe 11 rotates, the rotary joint 17 can avoid causing the gas conveying pipe 16 to rotate, and the gas conveying pipe 16 is used for conveying ammonia gas in the ammonia gas tank 14, so that the ammonia gas enters the spraying pipe 11, and then is sprayed out through the ammonia gas nozzle 12.

[0053] It can be understood that the rotary joint 17 is a common connecting component, which is a prior art means.

[0054] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments represent only the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Parts and features of some embodiments can be included or replaced by parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An ammonia injection grid structure for denitration, characterized by, The utility model relates to a flue gas denitration device, including: Flue (1), the flue gas in flue (1) passes from below to above; Baffle (2), set up in the inside of flue (1), the top end middle part of baffle (2) is fixedly connected with the smoke pipe (4); Unpowered air cap (6), located above baffle (2), and unpowered air cap (6) is detachably connected with smoke pipe (4); Connecting pipe (10), set up in the upper of unpowered air cap (6), the lateral wall of connecting pipe (10) is connected with the injection pipe (11), and the injection pipe (11) is connected with ammonia gas nozzle (12); Ammonia gas tank (14), set up in the outside of flue (1), the output of ammonia gas tank (14) is fixedly connected with the gas conveying pipe (16) of rotation intercommunication with connecting pipe (10).

2. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The opening of baffle (2) gradually reduces from below to above.

3. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The outside wall of the lower end of baffle (2) is fixedly connected with fixed sleeve (3), and fixed sleeve (3) is located in flue (1), and the outside wall of fixed sleeve (3) is fixedly connected with the inner wall of flue (1).

4. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The bottom of unpowered air cap (6) is fixedly connected with connecting seat (7), and the bottom of connecting seat (7) is fixedly connected with second flange (8); The output of smoke pipe (4) is fixedly connected with first flange (5), and first flange (5) is connected with second flange (8).

5. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The output of smoke pipe (4) corresponds to the middle part of the bottom of unpowered air cap (6).

6. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The bottom of connecting pipe (10) is fixedly connected with convex base (9), and the bottom of convex base (9) is fixedly connected with the middle part of the top of unpowered air cap (6).

7. The ammonia injection lattice structure for de-NOx according to claim 1, wherein The output of ammonia gas nozzle (12) faces downwards, and the output of ammonia gas nozzle (12) corresponds to the lateral wall air port of unpowered air cap (6).

8. The ammonia injection grid structure for denitration according to claim 1, wherein, The output of gas conveying pipe (16) is provided with a rotary joint (17), and the top of connecting pipe (10) is fixedly connected with an air inlet pipe (13) penetrating, and the air inlet pipe (13) is in rotation communication with the output of gas conveying pipe (16) through the rotary joint (17).

9. An ammonia injection grid structure for de-NOx according to any one of claims 1 to 8, characterized in that, The bottom of ammonia gas tank (14) is provided with a fixing seat (15), and the fixing seat (15) is fixedly connected with the outside wall of flue (1).

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